A casual way of saying to friends I'll see you again, sometime, (without a definite date or time having been set) - this is often abbreviated to 'Later' or 'Laters' as an alternative way of saying goodbye.

Shades of meaning is a phrase used to describe the small, subtle differences in meaning between similar words or phrases; 'kid' and 'youth' both refer to young people, but carry differing views and ideas about young people.